javascript - 如何更改 key 号码？

Question

我有这个对象:

a = {"formData": {
    "total": "60.00",
    "tr0_RTN": "PZH",
    "tr0_amount": "10.00",
    "tr2_RTN": "SUB",
    "tr2_amount": "30.00",
    "tr7_RTN": "KFC",
    "tr7_amount": "20.00",
}};

如何将键序列更改为:

a = {"formData": {
    "total": "60.00",
    "tr0_RTN": "PZH",
    "tr0_amount": "10.00",
    "tr1_RTN": "SUB",
    "tr1_amount": "30.00",
    "tr2_RTN": "KFC",
    "tr2_amount": "20.00",
}};

我可以用 native 或 lodash 做到这一点吗？

Answer 1

您可以获得所有相关 key ，查找零件并构建新的连续数字。

然后将旧值分配给新属性并删除旧键。

 old key       new key                      action
----------  ----------  --------------------------------------------
tr0_RTN     tr0_RTN     no, because old key and new key are the same
tr0_amount  tr0_amount  same as above
tr2_RTN     tr1_RTN     create new key, delete old key
tr2_amount  tr1_amount  same
tr7_RTN     tr2_RTN     same
tr7_amount  tr2_amount  same

var a = { "formData": { "total": "60.00", "tr0_RTN": "PZH", "tr0_amount": "10.00", "tr2_RTN": "SUB", "tr2_amount": "30.00", "tr7_RTN": "KFC", "tr7_amount": "20.00", } };

Object.keys(a.formData).filter(function (k) {
    return k.indexOf('tr') === 0;
}).sort(function (a, b) {
    return a.match(/\d+/) - b.match(/\d+/);
}).forEach(function (k) {
    var m = k.match(/(\d+)_(.*)/),
        kk;
    if (m[1] !== this.last) {
        this.counter++;
        this.last = m[1];
    }
    kk = 'tr' + this.counter + '_' + m[2];
    if (k !== kk) {
        a.formData[kk] = a.formData[k];
        delete a.formData[k];
    }
}, { counter: -1, last: '' });

console.log(a);